Abidi, Syeda Sakina, et al. “TOPICAL DILTIAZEM OINTMENT FOR POST-HEMORRHOIDECTOMY PAIN”. Journal of Ayub Medical College Abbottabad, vol. 33, no. 1, Feb. 2021, pp. 125-8, https://www.jamc.ayubmed.edu.pk/index.php/jamc/article/view/6722.